JP2004322746A

JP2004322746A - Airbag system

Info

Publication number: JP2004322746A
Application number: JP2003117443A
Authority: JP
Inventors: Takeshi Kai; 健甲斐
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2003-04-22
Filing date: 2003-04-22
Publication date: 2004-11-18
Anticipated expiration: 2023-04-22
Also published as: US20040212186A1; CN1539680A; US7152878B2; JP3784778B2; CN1274539C

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag system capable of controlling the airbag shape under development without need for attaching a control member inside the airbag. <P>SOLUTION: After each of 3 apexes of a triangular airbag is folded up toward the center of an airbag 32 and is connected to a retainer with a control member 39, the airbag 32 is folded up into an appropriated shape. During the pre-development stage of the airbag 32, the airbag 32 can be quickly inflated to a smaller value than the maximum capacity by preventing the airbag 32 from being inflated to the maximum capacity by the control member 39 so that an occupant restrained posture can be adjusted at the early stage of development. The internal pressure of the airbag 32 exceeds a predetermined value during the latter half of development stage, the control member 39 is broken or extended, thus ensuring sufficient occupant restrainability with the airbag 32 inflated to the maximum capacity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、折り畳まれたエアバッグおよびインフレータをリテーナに支持し、車両の衝突時にインフレータが発生するガスでエアバッグを膨張させて車室内に展開させるエアバッグ装置に関する。
【０００２】
【従来の技術】
車両の衝突時にインフレータから供給されるガスで車室内に展開して乗員を拘束するエアバッグの内面間を紐状体で連結し、エアバッグの展開時に紐状体が発生する張力で該エアバッグの容積の増加を規制し、エアバッグに乗員が二次衝突して内圧が所定値に達すると、紐状体が伸長あるいは破断してエアバッグの容積の更なる増加を許容することで乗員の拘束性能を高めるものが、下記特許文献により公知である。
【０００３】
【特許文献】
特許第３３５３４６３号公報
【０００４】
【発明が解決しようとする課題】
しかしながら上記従来のものは、紐状体をエアバッグの内部に取り付ける作業が面倒で加工コストが嵩む問題があり、しかも紐状体の張力だけでエアバッグの展開過程の形状を任意にコントロールするのが難しいという問題があった。
【０００５】
本発明は前述の事情に鑑みてなされたもので、エアバッグの内部に規制部材を設けることなく、展開過程のエアバッグの形状をコントロールできるようにすることを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、請求項１に記載された発明によれば、折り畳まれたエアバッグおよびインフレータをリテーナに支持し、車両の衝突時にインフレータが発生するガスでエアバッグを膨張させて車室内に展開させるエアバッグ装置において、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって折り曲げて該頂点部とリテーナとを規制部材で連結し、展開前期に前記規制部材でエアバッグの最大容積への膨張を規制するとともに、展開後期にエアバッグの内圧が所定値以上に増加すると、前記規制部材が破断または伸長してエアバッグの最大容積への膨張を許容することを特徴とするエアバッグ装置が提案される。
【０００７】
上記構成によれば、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって折り曲げて該頂点部とリテーナとを規制部材で連結したので、エアバッグの展開前期に規制部材が張力を発生して抵抗することで、エアバッグは最大容積よりも小さい容積に素早く膨張し、早期に乗員を拘束する態勢を整えることができる。その後の展開後期にエアバッグの内圧が所定値以上に増加すると、規制部材が破断または伸長することで、エアバッグが最大容積に膨張して充分な乗員拘束性能を発揮することができる。特に、多角形状のエアバッグの頂点部を中心部に向かって折り曲げたことで、展開前期におけるエアバッグの形状を適正に保つことができる。
【０００８】
また請求項２に記載された発明によれば、折り畳まれたエアバッグおよびインフレータをリテーナに支持し、車両の衝突時にインフレータが発生するガスでエアバッグを膨張させて車室内に展開させるエアバッグ装置において、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって内向きに押し込んで該頂点部とリテーナとを規制部材で連結し、展開前期に前記規制部材でエアバッグの最大容積への膨張を規制するとともに、展開後期にエアバッグの内圧が所定値以上に増加すると、前記規制部材が破断または伸長してエアバッグの最大容積への膨張を許容することを特徴とするエアバッグ装置が提案される。
【０００９】
上記構成によれば、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって内向きに押し込んで該頂点部とリテーナとを規制部材で連結したので、エアバッグの展開前期に規制部材が張力を発生して抵抗することで、エアバッグは最大容積よりも小さい容積に素早く膨張し、早期に乗員を拘束する態勢を整えることができる。その後の展開後期にエアバッグの内圧が所定値以上に増加すると、規制部材が破断または伸長することで、エアバッグが最大容積に膨張して充分な乗員拘束性能を発揮することができる。特に、多角形状のエアバッグの頂点部を中心部に向かって内向きに押し込んだことで、展開前期におけるエアバッグの形状を適正に保つことができる。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１１】
図１〜図７は本発明の第１実施例を示すもので、図１は自動車の車室前部の斜視図、図２は図１の２−２線拡大断面図、図３はエアバッグモジュールの分解斜視図、図４はエアバッグの分解斜視図、図５はエアバッグの平面図、図６はエアバッグの折り畳み順序の説明図、図７はエアバッグの展開過程の作用説明図である。
【００１２】
図１に示すように、運転席シート１１の前方に配置されたステアリングホイール１２の内部に運転席用のエアバッグモジュール１３が収納される。
【００１３】
図２および図３に示すように、ステアリングホイール１２は、ステアリングシャフト１４の後端にナット１５で固定されたボス部１６と、ボス部１６に固定されたフロントカバー１７と、フロントカバー１７の後面にボルト１８…で固定されたリヤカバー１９と、フロントカバー１７から放射状に延びる複数のスポーク部２０…と、スポーク部２０…の外周に連なるステアリングホイール本体部２１とを備える。リヤカバー１９の内周面にリテーナ２２がボルト１８…で共締めされており、このリテーナ２２にエアバッグモジュール１３が支持される。リヤカバー１９の内面には、エアバッグ３２の膨張時に破断する薄肉のティアライン１９ａ（図２参照）が形成される。
【００１４】
エアバッグモジュール１３は、燃焼により高圧ガスを発生する推薬を充填したインフレータ３１と、基布を縫製して構成したエアバッグ３２と、エアバッグ３２の基部を固定する固定リング３３とを備える。リテーナ２２の前面および後面に、インフレータ３１の外周に形成したフランジ３１ａと固定リング３３とが重ね合わされ、固定リング３３に設けたボルト３４…およびナット３５…で固定される。このとき、リテーナ２２の後面と固定リング３３との間にエアバッグ３２の基部が挟まれて固定される。
【００１５】
図４および図５に示すように、頂点部を丸めた三角形状のエアバッグ３２は後ろ側（乗員に対向する側）の第１基布３６と、その前面に重ね合わされる第２基布３７とを備え、第１、第２基布３６，３７は外周の縫製部３８で一体に縫製される。エアバッグ３２の基部となる第２基布３７の中央にはインフレータ３１を囲む円形の開口３７ａと、エアバッグ３２の展開後期にガスの一部を逃がす２個のベントホール３７ｃ，３７ｃと、４本のボルト３４…が貫通する４個のボルト孔３７ｂ…とが形成される。
【００１６】
三角形状のエアバッグ３２の３個の頂点部に、３枚の布製の規制部材３９の一端が縫製部４０…でそれぞれ縫製される。各規制部材３９は、その他端に４個のボルト孔３９ａ…が形成された環状の固定部３９ｂを備えるとともに、その適宜の位置に張力が所定値を超えると破断するミシン目状の脆弱部３９ｃが形成される。
【００１７】
図６に示すように、三角形状のエアバッグ３２は、３個の頂点部に臨む３本の折り線４１…で前方（第２基布３７側）に折り畳まれ、３個の規制部材３９…の固定部３９ｂ…が相互に重ね合わされ、それらのボルト孔３９ａ…を貫通する前記ボルト３４…でリテーナ２２に共締めされる。この状態で概略六角形状になったエアバッグ３２は、適宜の順序で更に小さく折り畳まれリヤカバー１９の内部に収納される。
【００１８】
しかして、車両の衝突時に所定値以上の加速度が検出されるとインフレータ３１が点火し、折り畳まれたエアバッグ３２がインフレータ３１が発生するガスで膨張を開始する。エアバッグ３２が膨張する圧力を受けたリヤカバー１９はティアライン１９ａが破断し、そこに形成された開口からエアバッグ３２が車室内に展開する。
【００１９】
図７に実線で示すように、エアバッグ３２の展開前期には、膨張しようとするエアバッグ３２が３枚の規制部材３９…の張力によって六角形状に規制されて最大容積まで膨張することができず、最大容積よりも若干小さい容積まで膨張する。このように、エアバッグ３２を展開前期に最大容積よりも小さい容積に膨張させることで、早期に乗員を拘束する態勢を整えることができる。展開後期にインフレータ３１から供給されるガスでエアバッグ３２の内圧が所定値以上に高まると、鎖線で示すように、３枚の規制部材３９…の脆弱部３９ｃ…が破断し、３つの頂点部が解放されることでエアバッグ３２は最大容積の三角形状に膨張し、最大限の乗員拘束性能を発揮することができる。
【００２０】
このように、エアバッグ３２の内部に組み付けが困難な紐状体を設けることなく、エアバッグ３２の外部に組み付けが容易な規制部材３９…を設けるだけで、エアバッグ３２の展開過程を任意にコントロールすることが可能になる。しかも展開前期のエアバッグ３２は、その頂点部を折り曲げたことで円形に近い六角形状になるため、その容積が小さくても乗員を効果的に拘束することができる。
【００２１】
次に、図８に基づいて本発明の第２実施例を説明する。
【００２２】
第１実施例では規制部材３９…に設けた脆弱部３９ｃ…を破断させてエアバッグ３２を最大容積に展開させているが、第２実施例の規制部材３９…は脆弱部３９ｃ…を備えておらず、その代わりに充分に長く形成した規制部材３９…の中間部を手繰って縫製部４２…で縫製して長さを短くしたものである。
【００２３】
この第２実施例によれば、エアバッグ３２の展開前期にエアバッグ３２の膨張を３枚の規制部材３９…の張力によって規制し、展開後期にエアバッグ３２の内圧が所定値以上に高まると、３枚の規制部材３９…の縫製部４２…が破断して長さが伸長することで、エアバッグ３２の最大容積への膨張を可能にすることができる。しかして、この第２実施例によっても上述した第１実施例と同様の作用効果を達成することができる。
【００２４】
次に、図９および図１０に基づいて本発明の第３実施例を説明する。
【００２５】
上述した第１、第２実施例では、三角形状のエアバッグ３２の３個の頂点部を３本の折り線４１…で前方に折り畳んでいるが、第３実施例では３個の頂点部を袋を裏返すようにしてエアバッグ３２の内部に押し込み、３個の規制部材３９…の固定部３９ｂ…をエアバッグ３２の内部で相互に重ね合わせてボルト３４…でリテーナ２２に共締めしている。
【００２６】
尚、第１、第２実施例の規制部材３９…はエアバッグ３２の頂点部から外側に突出しているが、第３実施例の規制部材３９…は予めエアバッグ３２の内部に収納されている。
【００２７】
この第３実施例によっても、上述した第１、第２実施例と同様の作用効果を達成することができる。
【００２８】
以上、本発明の実施例を詳述したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。
【００２９】
例えば、実施例では運転席用のエアバッグモジュール１３を例示したが、本発明は助手席用あるいはその他の用途のエアバッグモジュールに対しても適用することができる。
【００３０】
また実施例ではエアバッグ３２の形状を三角形状にしているが、四角形状等の多角形状であれば良い。
【００３１】
また規制部材３９は布に限定されず、紐や糸のような部材であっても良い。
【００３２】
【発明の効果】
以上のように請求項１に記載された発明によれば、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって折り曲げて該頂点部とリテーナとを規制部材で連結したので、エアバッグの展開前期に規制部材が張力を発生して抵抗することで、エアバッグは最大容積よりも小さい容積に素早く膨張し、早期に乗員を拘束する態勢を整えることができる。その後の展開後期にエアバッグの内圧が所定値以上に増加すると、規制部材が破断または伸長することで、エアバッグが最大容積に膨張して充分な乗員拘束性能を発揮することができる。特に、多角形状のエアバッグの頂点部を中心部に向かって折り曲げたことで、展開前期におけるエアバッグの形状を適正に保つことができる。
【００３３】
また請求項２に記載された発明によれば、多角形状のエアバッグの複数の頂点部をそれぞれ中心部に向かって内向きに押し込んで該頂点部とリテーナとを規制部材で連結したので、エアバッグの展開前期に規制部材が張力を発生して抵抗することで、エアバッグは最大容積よりも小さい容積に素早く膨張し、早期に乗員を拘束する態勢を整えることができる。その後の展開後期にエアバッグの内圧が所定値以上に増加すると、規制部材が破断または伸長することで、エアバッグが最大容積に膨張して充分な乗員拘束性能を発揮することができる。特に、多角形状のエアバッグの頂点部を中心部に向かって内向きに押し込んだことで、展開前期におけるエアバッグの形状を適正に保つことができる。
【図面の簡単な説明】
【図１】自動車の車室前部の斜視図
【図２】図１の２−２線拡大断面図
【図３】エアバッグモジュールの分解斜視図
【図４】エアバッグの分解斜視図
【図５】エアバッグの平面図
【図６】エアバッグの折り畳み順序の説明図
【図７】エアバッグの展開過程の作用説明図
【図８】第２実施例に係るエアバッグの規制部材を示す図
【図９】第３実施例に係るエアバッグの、前記図６（Ｃ）に対応する図
【図１０】図９の１０−１０線断面図
【符号の説明】
２２リテーナ
３１インフレータ
３２エアバッグ
３９規制部材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an airbag device that supports a folded airbag and an inflator with a retainer, inflates the airbag with gas generated by the inflator when the vehicle collides, and deploys the airbag into a vehicle interior.
[0002]
[Prior art]
The inner surface of an airbag that expands into the passenger compartment with gas supplied from an inflator at the time of a vehicle collision and restrains an occupant is connected by a string-shaped body, and the airbag is tensioned by the string-shaped body when the airbag is deployed. When the internal pressure reaches a predetermined value due to the secondary collision of the occupant with the airbag, the cord-like body expands or breaks to allow a further increase in the volume of the airbag. What enhances binding performance is known from the following patent documents.
[0003]
[Patent Document]
Japanese Patent No. 3353463
[Problems to be solved by the invention]
However, the above-mentioned conventional one has a problem in that the work of attaching the cord to the inside of the airbag is troublesome and the processing cost increases, and furthermore, the shape of the airbag deployment process can be arbitrarily controlled only by the tension of the cord. There was a problem that was difficult.
[0005]
The present invention has been made in view of the above circumstances, and has as its object to control the shape of an airbag during the deployment process without providing a regulating member inside the airbag.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a folded airbag and an inflator are supported by a retainer, and the airbag is inflated with gas generated by the inflator at the time of a collision of the vehicle. In an airbag device to be deployed indoors, a plurality of apexes of a polygonal airbag are bent toward the center, respectively, and the apexes and the retainer are connected by a regulating member. And regulating the inflation to the maximum volume of the airbag, and when the internal pressure of the airbag increases to a predetermined value or more in the late stage of deployment, the regulating member breaks or expands to allow inflation to the maximum volume of the airbag. Is proposed.
[0007]
According to the above configuration, the plurality of apexes of the polygonal airbag are bent toward the center, respectively, and the apexes and the retainer are connected by the restricting member. By generating and resisting, the airbag quickly inflates to a volume smaller than the maximum volume, and can be prepared to restrain the occupant early. When the internal pressure of the airbag increases to a predetermined value or more in the later stage of deployment, the regulating member breaks or expands, so that the airbag inflates to the maximum volume and exhibits sufficient occupant restraint performance. In particular, by bending the apex of the polygonal airbag toward the center, the shape of the airbag in the initial stage of deployment can be appropriately maintained.
[0008]
According to the invention described in claim 2, the airbag device supports the folded airbag and the inflator with the retainer, and inflates the airbag with gas generated by the inflator when the vehicle collides to deploy the airbag in the vehicle interior. In each of the polygonal airbags, a plurality of apexes are pushed inward toward the center, respectively, and the apexes and the retainer are connected by a regulating member. An airbag device that restricts inflation of the airbag and that when the internal pressure of the airbag increases to a predetermined value or more in a later stage of deployment, the restricting member breaks or expands to allow inflation to the maximum volume of the airbag. Is proposed.
[0009]
According to the above configuration, the plurality of apexes of the polygonal airbag are pushed inward toward the center, respectively, and the apexes and the retainer are connected by the restricting member. By generating tension and resisting, the airbag quickly inflates to a volume smaller than the maximum volume, and can be prepared to restrain the occupant early. When the internal pressure of the airbag increases to a predetermined value or more in the later stage of deployment, the regulating member breaks or expands, so that the airbag inflates to the maximum volume and exhibits sufficient occupant restraint performance. In particular, by pushing the apex of the polygonal airbag inward toward the center, the shape of the airbag in the initial stage of deployment can be appropriately maintained.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0011]
1 to 7 show a first embodiment of the present invention. FIG. 1 is a perspective view of a front part of a vehicle compartment of an automobile, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 4 is an exploded perspective view of the airbag, FIG. 5 is a plan view of the airbag, FIG. 6 is an explanatory view of the folding order of the airbag, and FIG. is there.
[0012]
As shown in FIG. 1, an airbag module 13 for a driver's seat is housed inside a steering wheel 12 arranged in front of a driver's seat 11.
[0013]
As shown in FIGS. 2 and 3, the steering wheel 12 includes a boss 16 fixed to a rear end of the steering shaft 14 with a nut 15, a front cover 17 fixed to the boss 16, and a rear surface of the front cover 17. , A plurality of spoke portions 20 extending radially from the front cover 17, and a steering wheel body 21 connected to the outer periphery of the spoke portions 20. A retainer 22 is fastened to the inner peripheral surface of the rear cover 19 with bolts 18. The airbag module 13 is supported by the retainer 22. On the inner surface of the rear cover 19, a thin tear line 19a (see FIG. 2) that is broken when the airbag 32 is inflated is formed.
[0014]
The airbag module 13 includes an inflator 31 filled with a propellant that generates high-pressure gas by combustion, an airbag 32 formed by sewing a base cloth, and a fixing ring 33 for fixing a base of the airbag 32. A flange 31a formed on the outer periphery of the inflator 31 and a fixing ring 33 are superimposed on the front and rear surfaces of the retainer 22, and are fixed by bolts 34 and nuts 35 provided on the fixing ring 33. At this time, the base of the airbag 32 is fixed between the rear surface of the retainer 22 and the fixing ring 33.
[0015]
As shown in FIGS. 4 and 5, a triangular airbag 32 having a rounded apex has a first base cloth 36 on the rear side (the side facing the occupant) and a second base cloth 37 overlapped on the front side thereof. The first and second base cloths 36 and 37 are integrally sewn at a sewing portion 38 on the outer periphery. At the center of the second base cloth 37 serving as the base of the airbag 32, a circular opening 37a surrounding the inflator 31, two vent holes 37c, 37c for allowing a part of gas to escape in the late stage of deployment of the airbag 32, and 4 Four bolt holes 37b through which the bolts 34 penetrate are formed.
[0016]
At three apexes of the triangular airbag 32, one ends of three cloth regulating members 39 are sewn at sewing portions 40, respectively. Each regulating member 39 includes an annular fixing portion 39b having four bolt holes 39a at the other end, and a perforated weak portion 39c which breaks when the tension exceeds a predetermined value at an appropriate position. Is formed.
[0017]
As shown in FIG. 6, the triangular airbag 32 is folded forward (toward the second base fabric 37) by three folding lines 41 facing three apexes, and three regulating members 39. Are fixed to each other and fastened to the retainer 22 together with the bolts 34 passing through the bolt holes 39a. In this state, the airbag 32 having a substantially hexagonal shape is further folded smaller in an appropriate order and stored inside the rear cover 19.
[0018]
Thus, when an acceleration equal to or more than a predetermined value is detected at the time of a vehicle collision, the inflator 31 is ignited, and the folded airbag 32 starts inflating with the gas generated by the inflator 31. The tear line 19a of the rear cover 19 that has received the pressure to inflate the airbag 32 is broken, and the airbag 32 is deployed into the vehicle cabin from the opening formed therein.
[0019]
As shown by the solid line in FIG. 7, in the first half of the deployment of the airbag 32, the airbag 32 to be inflated is restricted to a hexagonal shape by the tension of the three regulating members 39. Instead, expand to a volume slightly smaller than the maximum volume. In this way, by inflating the airbag 32 to a volume smaller than the maximum volume in the initial stage of deployment, the posture for restraining the occupant at an early stage can be prepared. When the gas supplied from the inflator 31 increases the internal pressure of the airbag 32 to a predetermined value or more in the late stage of deployment, as shown by the dashed lines, the weak portions 39c of the three regulating members 39 are broken and the three apexes are formed. Is released, the airbag 32 is inflated into a triangular shape having a maximum volume, and can exhibit maximum occupant restraint performance.
[0020]
As described above, the deployment process of the airbag 32 can be arbitrarily performed only by providing the regulating members 39 that are easy to assemble outside the airbag 32 without providing a string-like body that is difficult to assemble inside the airbag 32. Control becomes possible. In addition, since the airbag 32 in the initial stage of deployment has a hexagonal shape close to a circular shape by bending its apex, the occupant can be effectively restrained even if its volume is small.
[0021]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0022]
In the first embodiment, the airbag 32 is expanded to the maximum volume by breaking the fragile portions 39c provided on the restricting members 39. However, the restricting members 39 of the second embodiment include the fragile portions 39c. Instead, the intermediate portions of the sufficiently long regulating members 39 are manually cut and sewn at sewing portions 42 to shorten the length.
[0023]
According to the second embodiment, the inflation of the airbag 32 is regulated by the tension of the three regulating members 39 in the first half of the deployment of the airbag 32, and when the internal pressure of the airbag 32 increases to a predetermined value or more in the second half of the deployment. The sewn portions 42 of the three regulating members 39 are broken and their lengths are extended, so that the airbag 32 can be expanded to the maximum volume. Thus, according to the second embodiment, the same operation and effect as those of the first embodiment can be achieved.
[0024]
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0025]
In the first and second embodiments described above, the three vertices of the triangular airbag 32 are folded forward by three fold lines 41..., But in the third embodiment, the three vertices are The bag is turned over and pushed into the inside of the airbag 32, and the fixing portions 39 b of the three regulating members 39 are overlapped with each other inside the airbag 32 and jointly fastened to the retainer 22 with bolts 34. .
[0026]
Although the regulating members 39 of the first and second embodiments protrude outward from the top of the airbag 32, the regulating members 39 of the third embodiment are housed in the airbag 32 in advance. .
[0027]
According to the third embodiment, the same operation and effect as those of the first and second embodiments can be achieved.
[0028]
Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.
[0029]
For example, in the embodiment, the airbag module 13 for the driver's seat is illustrated, but the present invention can be applied to an airbag module for a passenger seat or other uses.
[0030]
In the embodiment, the shape of the airbag 32 is triangular. However, any shape may be used as long as the shape is a polygon such as a square.
[0031]
Further, the regulating member 39 is not limited to the cloth, and may be a member such as a string or a thread.
[0032]
【The invention's effect】
As described above, according to the invention described in claim 1, a plurality of apexes of the polygonal airbag are bent toward the center, respectively, and the apexes and the retainer are connected by the regulating member. Since the regulating member generates tension and resists in the first half of the deployment of the bag, the airbag quickly inflates to a volume smaller than the maximum volume, and can be prepared to restrain the occupant early. When the internal pressure of the airbag increases to a predetermined value or more in the later stage of deployment, the regulating member breaks or expands, so that the airbag inflates to the maximum volume and exhibits sufficient occupant restraint performance. In particular, by bending the apex of the polygonal airbag toward the center, the shape of the airbag in the initial stage of deployment can be appropriately maintained.
[0033]
According to the invention described in claim 2, a plurality of apexes of the polygonal airbag are pushed inward toward the center, respectively, and the apexes and the retainer are connected by the regulating member. Since the regulating member generates tension and resists in the first half of the deployment of the bag, the airbag quickly inflates to a volume smaller than the maximum volume, and can be prepared to restrain the occupant early. When the internal pressure of the airbag increases to a predetermined value or more in the later stage of deployment, the regulating member breaks or expands, so that the airbag inflates to the maximum volume and exhibits sufficient occupant restraint performance. In particular, by pushing the apex of the polygonal airbag inward toward the center, the shape of the airbag in the initial stage of deployment can be appropriately maintained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a front portion of a cabin of an automobile. FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1. FIG. 3 is an exploded perspective view of an airbag module. FIG. 5 is a plan view of the airbag. FIG. 6 is an explanatory view of the folding order of the airbag. FIG. 7 is an explanatory view of the operation of the process of deploying the airbag. FIG. 9 is a view corresponding to FIG. 6C of the airbag according to the third embodiment. FIG. 10 is a sectional view taken along line 10-10 of FIG.
22 Retainer 31 Inflator 32 Airbag 39 Regulator

Claims

折り畳まれたエアバッグ（３２）およびインフレータ（３１）をリテーナ（２２）に支持し、車両の衝突時にインフレータ（３１）が発生するガスでエアバッグ（３２）を膨張させて車室内に展開させるエアバッグ装置において、
多角形状のエアバッグ（３２）の複数の頂点部をそれぞれ中心部に向かって折り曲げて該頂点部とリテーナ（２２）とを規制部材（３９）で連結し、展開前期に前記規制部材（３９）でエアバッグ（３２）の最大容積への膨張を規制するとともに、展開後期にエアバッグ（３２）の内圧が所定値以上に増加すると、前記規制部材（３９）が破断または伸長してエアバッグ（３２）の最大容積への膨張を許容することを特徴とするエアバッグ装置。Air for supporting the folded airbag (32) and the inflator (31) on a retainer (22), and inflating the airbag (32) with gas generated by the inflator (31) at the time of collision of the vehicle to deploy the airbag in the vehicle interior. In the bag device,
A plurality of apexes of the polygonal airbag (32) are bent toward the center, respectively, and the apexes and the retainer (22) are connected by a restricting member (39). Regulates the inflation of the airbag (32) to its maximum volume, and when the internal pressure of the airbag (32) increases to a predetermined value or more in the late stage of deployment, the regulating member (39) breaks or expands, and the airbag (32) is broken. 32) An airbag device, which allows inflation to a maximum volume.

折り畳まれたエアバッグ（３２）およびインフレータ（３１）をリテーナ（２２）に支持し、車両の衝突時にインフレータ（３１）が発生するガスでエアバッグ（３２）を膨張させて車室内に展開させるエアバッグ装置において、
多角形状のエアバッグ（３２）の複数の頂点部をそれぞれ中心部に向かって内向きに押し込んで該頂点部とリテーナ（２２）とを規制部材（３９）で連結し、展開前期に前記規制部材（３９）でエアバッグ（３２）の最大容積への膨張を規制するとともに、展開後期にエアバッグ（３２）の内圧が所定値以上に増加すると、前記規制部材（３９）が破断または伸長してエアバッグ（３２）の最大容積への膨張を許容することを特徴とするエアバッグ装置。Air for supporting the folded airbag (32) and the inflator (31) on a retainer (22), and inflating the airbag (32) with gas generated by the inflator (31) at the time of collision of the vehicle to deploy the airbag in the vehicle interior. In the bag device,
A plurality of apexes of the polygonal airbag (32) are pushed inward toward the center, respectively, and the apexes and the retainer (22) are connected by a regulating member (39). (39) restricts the inflation of the airbag (32) to the maximum volume, and when the internal pressure of the airbag (32) increases to a predetermined value or more in the late stage of deployment, the restricting member (39) breaks or expands. An airbag device characterized by allowing inflation of the airbag (32) to a maximum volume.